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SNMP Information from your DLink DSL-300 ADSL Modem

Not many people know it, but the DLink DSL-300 ADSL modem has SNMP management capabilities. And for such a small and cheap network device, its not too bad an implementation of it. Or perhaps I’ve just seen a lot of dead-awful ones to compare objectively. Of course the displaying of the private community in the MIB, which is something the DSL-300 does, is a pretty dumb idea.

I should point out right here that these instructions work for me. They might work for you, or you might just find some easter egg in the modems firmware that turns it into a smoke machine So do any of this stuff at your own risk.

You will have to connect to the modem using a serial port first to find out the IP address and change either your computers or the modems IP address so they are in the same network. Note that this address is not the same as the one your provider gives. And the communities are the very hard to guess public and private for read-only and read-write respectively.

The modem has some of the standard SNMP MIBs that anyone who’s played with SNMP will quickly recognise, such as.

All pretty standard stuff you see in pretty much any device. All the good information is always found in the private enterprises part of the MIB, and the DSL-300 is no exception. The problem is that if you ask
DLink about it, they will tell you nothing. The nice thing about DLink is they’re pretty consistent about annoying the hell out of their customers by denying them technical information.

With that rant out of the way, its time to work out for myself what these values are for. I’ve got some worked out but it will take some more time to get it all clear and possibly some will never be worked out, thanks DLink!

All OIDs start with private.enterprises.171.11 There are quite a few gaps so if you know what the missing values mean, drop me a line.